Can any one help me how can i reduce the time complexity and space complexity of Error detection techniques such as(VRC,LRC,CRC,Checksum) by using Data structures..... Some type of explanation

Almost 1 month had been completed & i feel very exiting for upcoming months Last month i did not participate in many contests in upcoming days i am thinking to participate in more contests should i go for join more contests or i continue to practice more.... please suggest me in comments!!!!

13 Sept 2022, Today I am starting Codeforces, lets see where it goes, after a one year.............